Joe Biden / John Moore, Getty Images

by David Jackson, USA TODAY

by David Jackson, USA TODAY

Biden will reportedly speak at major Democratic fundraisers over the next two months in South Carolina and Michigan, states that have played key roles in past presidential nomination contests and may do so again in 2016.

Biden, 70, has not ruled out his own presidential bid as President Obama completes his second term in office.

Like many potential candidates, Biden's plans may depend on whether former Secretary of State Hillary Rodham Clinton decides to run in 2016.